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msn@ @www d: Mmmm@ WILLIAM; TfNmHoLsoN. or rRoViDENcE, RHODE ISLAND. i

Letters Patent No. 80,993, dated August 11, 1868.

`IMPROVElldEN'l IN MACHINES FOB. CUTTING RASPS.

ett'rtrhnie wenn to in itis rtters @niet mit mating met nf tige same.

TO ALL WHOM IT MAY CONCERN:

Beit known that I, WILLiAM T. NIcHoLsoN, of the city and countyof Providence, in the State of Rhode' Island, havevnve'ntedfa new and useful Improvement in Machinery for Making Rasps and'I do hereby declare that the following specification, taken in connection with the drawings making a part of the same, is a full, 1 clear, and exact description thereof. i

Figure 1, sheet- 1, is aplan. Figure 2, sheet 1, is a side view. Figure 3, sheet 2, is the opposite side view, showing the mechanism for feeding forward the blank'. Figure 4 is an end view, a portion of the framing being removed, to show the ineens by which a lateral movement isl given tothe bed on which the blank rests.

"Figures 5 and 6 are respectively longitudinal and transverse sections of a corrugated eccentric-shaft, hereafterto be referred to. l i i The face of a. rasp differs from the face of se ilein this, that the teeth'of thc former are not the result of diagonal cuts across the face of the blank crossing each other, but each tooth is distinct by itself, and is raised by the blow of a pointed punch-driver into the surface of the blank in a direction oblique `to its plane.A The several teeth are.l arranged in rows-'across theblanli, but the teeth o f'eaich rortr alternate with the spaces between the severalteeth-of the rowsnext adjoining upon veach side. i

Inthe drawings, it will be seenl that the operative parts of the machine are mounted on or are attached to a strong and suitable frame, A. v i l B is the driving-shaft, to which, in place of the crank shown in the drawing, a 'pulley and balance-wheel should be attached. v I n -The bevelled-gear wheel C, on the driving-shaft, engages with'tho bevelled-gear wheel C,keyled to the transverse shaft D, and gives a rotating movement-to the wild-cat or-tappet-wheel E. l y y,

The punching-apparatus is shown clearly in-fig. 2, andv it is 'not unlike, in principle or in operation, the apparatus frequently employed in leoutting machines for cutting the teeth upon aile-blank.

As isA seen in the drawing, the tappets lupon the wild-oat wheel E successively lift the stock which holds the punch, compressing thereby the spring a, whichlspring, when, bythe revolution of Athe-wheel E, the tappets slide o' the projecting arm b of the cutter-stock, drives downthe punch with a force due to the power of the spring.

. The blank to be cut is placed upon a bed, F, and held thereon in the usual way. To this bdfaregiven two movements, one in the direction ofits length, as in an ordinary {ile-cutting machine,'and the other ,in a line at right angles therewith.

. The transverse movement of the {ile-bed is'eil'octed as follows: l v

Projecting from the side of .the bed, midwaybctween its two extremities, (iig 3,) is a sti-1d, c', 'carrying in its end a friction-roller, fl. The face of this roller bears against the surface ot" the longitudinal-shaft G, shown in dotted-lines-at g. 4, and in section at figs.v 5 and 6, following al1 its inequalities.4 i This'shoft is hung in hearings set in the end-frames of the machine, and'has-a-constant rotating movementfgivenzto it by means of the toothed wheel H, on the driving-shaft, operating upbn the pinion J, keyed-to the axle'of the vshaft G, through the intermediate gears J' d', as shown more clearly at figs. l and 2. i i

The shaft Gr is seteecentrically upon its axis, (lig. 6,) and, moreover, its surfaceis corrugated, so that the outline of its section will show'. a wave or irregular line, (iig. 5.) v

The tile-bed F rests upon'a tableor suitable supports, so that it can bemoved either longitudinally or sidewise, when lthe respective machinery appropriate to the productionoi suchimovements v is required to act. The

le-bed will be held down 'suihciently by its own weight, and by the straps or bands which are made fast lto its ends, and wound around the drum, which is connected with and forms a part of the machinery for feeding the bed, in the direction of its length, underneath the punching-toch i Themechanism for intermittently moving the {ile-bed inthe direction of yitslength is arranged-to operar 

